US1561265A - Speed-regulator system - Google Patents

Description

'Nov. 10,1925. 1,561,265

I v W. E. MENZIES SPEED REGULATOR SYSTEM Filed Jan. 12, 1920 7B5 fig WITNESSES: I INVENTOR M I Y l Vzlllamfi'fifi'lzzlai' BY W6 ATTORNEY Patented Nov. 10, 1925.

UNITEDSTATES PATENT orncs.

WILLIAM 'E. MENZIES, OF IRWIN, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELECTRIC 8c MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

' SPEED-REGULATOR SYSTEM.

Application filed January 12, 1920. Serial at. 350,734.

To all whom it may concern."

Be it known that I, WILLIAM E. MENzrm,

' a citizen of the United States, and a resident of Irwin, in the county of Westmoreland and State of Pennsylvania, have invented a new and useful Improvement in Speed-Regulator Systems, of which the following is a specification. 7 i

My invention relates'to regulator systems and particularly to regulator systems for controlling the speeds of rotating members.

One object of my invention is to provide a regulator system that shall govern .the speeds of a numberof motors and that shall maintaina constant speed ratio between the 14.. and 1 5 which are connecte motors v3 and 4 are rovided for rotating other roll units (not s own). The motor 2 comprises an armature 5, which is connected across the. supply circuit comprising conductors 6 and 7, and a field-magnet winding 8 which is connected, through a resistor 9,

across an auxiliary supply circuit comprising conductors 10 and 11. The motors 3 and 4 respectively comp- rise armatures 12 and 13,

which are connected across the supply conductors 6 and 7, and field-ma net windings 5, through resistors 16, and 17 across the supply conductors 10 and 11.

Thearmature shaft 18 of the motor 2 is geared to the roll 1 in any suitable manner,

as by means of gear wheels 19. The shaft 18" is further provided with a friction wheel 20 which engages a friction disk 21. The friction disk 21 is mounted on a. shaft 22 which also supports a commutator device 23. Thus,

a paper mill, each set. of paper rolls is individually motor driven and the various motors are so controlled as to maintain a con v stant speed ratio between them.

In one method of practicm my invention, each set of rolls is operated y a main mo-:

tor, preferably a direct-current motor, and a commutator is operated by each main motor in accordance with the Speed of the asso ciated, rolls. A synchronous motor is associated with each main motor and a' comm.11-. tator is controlled by each of said synchronous motors. The field-magnet winding circuits of the main motors are provided with resistors which are selectively short-circuited by said commutators to maintain a constant speed ratio between the main motors.

In the accompanying drawing, Figure 1 is a diagrammatic view of a regulator'system embodying my invention, andFig. 2 is a diagrammaticview of the commutator devicesshown inFig. 1. 7

Referring to the accompanying drawing, a paper mill is provided with a plurality of sets of rolls, one roll onl of one set being shown on the drawing. roll 1 is operated by a direct-current motor 2, and two other the commutator device 23 is rotated'in accordance with the speed of the motor 2, and

the friction wheel 20 is moved, relative to the friction disk 21, to maintain-any desired ratio of speed between the motor 2 and the commutator device 23. Any suitable means may be provided for varying the position of the friction wheel relatlve to the friction disk. Obviously, any other speed-changing device may be-provided, such as co'ne pulleys. The motors?) and 4 operate rolls and commutator devices in the same manner as that shown in connectlon .w1th the motor 2 and,

inasmuch as these motors operate in the to completelyillustrate and deand i.

A direct-current'generator 24, comprising an armature 25 and a field-magnet winding 26, is connected to the supply circuit come parts operated by the motors?) same. manner as the motor 2, it is deemedunjnecessar scr1be t prising conductors 6 and 7. A rheostat 27 is connected in circuit with the'field-magnet I winding 26 for varying the excitation of the generator to control thevoltage which is impressed upon the conductors6 and 7. Thus,

b varying the excitation of the generator 24:, the speed of the motors 2, 3 and 4; may be varied without changingt-he'speed ratio between such motors.

3 and 4., one only of which, 28, is illustrated on the drawing. The synchronous motor 28 comprises; a

Asynchronous motor is associated with each of the motors 2,

armature 41 which is connected across the' supply conductors 6 and 7. The generator 38 comprises a field-magnet winding 42 and an armature 43 which is connected to the 1 connected and which are disposed adjacent supply circuit comprising conductors 32, 33 and 34.

The commutator device 23 comprises two insulatingsegments 44 and 45, which extend 180 around the device, and two conducting segments 46 and 47 which. are electrically to the segments 44 and 45. Brushes 48 and 49 are provided which respectively engage the segments '44 and 47 and segments 46 and 45, and a third brush 50 is provided which is disposed 180 from the brushes48 and 49. The brush 50is of such width as to engage all segments during the rotation of the commutator device.

The commutator device 36 comprises two conducting segments 51 and 52 and two insulating segments 53 and 54 which are dis-. posed adjacent to the conducting segments 51 and 52. Each of the conducting seg-' ments and insulating segments extends 180 around the commutator device. A brush 55 engages the segments 51 and 54, a brush 56 engages the segments 52, and 53 and a brush 57 engages all commutator segments. The brush 49 of the commutator device 23 is directly connected to the brush 55 of the commutator segment 36., and the brush 48 is directly connected to the brush 56 as illustrated in Fig. 2 of the-drawing. Brushes 50' and 57 are respectively connected to opposite terminals of the resistor 9.

When the system is in operation, each of the main motors 2, 3 and 4 operates a roll similar to the roll 1 associated with the motor 2 and the relative speeds of these rolls is maintained constant by means of commutator devices two only of which, 36 and 23 that are associated with the roll 1, are illustrated upon the drawing. The friction .23 and 36 are rotating synchronously, two

circuits are alternately completed through the two commutator devices for short-cir- The 2 cuiting the resistor 9. The first circuit extends from one terminal of the resistor 9, through the brush 50, contact segments 47 and 46, brushes 49 and 55, commutator segments 51 and 52, and the vbrush 57, to the other terminal. of the resistor 9. The second circuit for short-circuiting the resistor extends from one terminal of the resistor 9, through the brush 50, contact segments 46 and 47, brushes 48 and 56, commutator segments 52 and 51, and the brush 57, to the' other terminal of the resistor 9.

In case the speed of the commutator device 23 varies relative to the speed of the commutator device 36, the proportion of time the brushes 48 and 56, 49 and 55, and 50 and 57 short-circuit the resistor 9 is correspondinglyivaried. Thus, during-a portion of the time, the brush 48 will be on the insulating segment 44 when the brush 56 is on the conducting segment 52 and, vice versa, the brush 56 will be in engagement with the insulating segment 53 when the brush 48 is in engagement with the conducting segment 47. Moreover, the brush 49 will be in engagement with the insulating segment 45 during a portion of the time that the brush 55 is in engagement with the conducting segment 51, and the brush 55 will be in engagement with the insulating segment 54 during a portion of the time that the brush 49 is in engagement with the conducting segment 46. I

If the two commutator devices have been displaced 180 relative to each other, it is apparent that the brush 48 will be in engagement with the insulating segment 44 when the brush 56 is in engagement with the conducting segment 52, and the brush 49 will be in engagement with the insulating segment 45 when the brush 55 is in engagement with the conducting segment 51. Thus, the short-circuit is completely removed from the resistor 9. Between such extreme positions, when the two commutator devices are rotatlng synchronously and when the two devices are moved 180 relative to each other, it is apparent that the intervals of time during which the resistor 9 is short-circuited may be varied in accordance with the speed of the motor 2. i

In the commutator devices illustrated in the drawing, the various segments extend 180 around the device and the brushes 50 and 57 are disposed 180 from the brushes 48,49, 55 and 56 but, if closer regulation is desired, the number of segments may be increased and the brushes moved closer together in accordance therewith. Thus, if the commutator segments were doubled in number and extended only 90 around the commutator device, the brushes 50 and 57 would be located only 90 away from the brushes 48, 49, 55 and 56. Moreover, if so desired, the synchronous motors, which are lldidi associated with the main motor "for operating the commutator devices, may be replaced by a rotating shaft.

The commutator devices, which are associated with the motors 3 and l, operate in a manner similar to that of the commutator devices 23 and 36 and, inasmuch as the synchronous motors operate at the same speeds, it is apparent that the commutator devices will maintain the speed ratio between the motors 2, 3 and 4 substantially constant. If it is desired to change the speed of all the motors 2, 3 and 4: simultaneously, the rheostat 27 is varied to control the voltage which is impressed upon the supply conductors 6 and 7. The voltage on the supply circuit comprising conductors 6 and 7 in turn determines the speed of the motors 2,3 and l. Adjustments for operating the propelling motors 2, 3 and 4 at variable relative speeds that may be maintained substantially-constant, may be made by meansof the speedchanging devices operated by the propelling motors.

Other modifications in the system and in the arrangement and location of parts may be made within the spirit and scope of my invention and such modifications are inlid tended to be covered by the appended claims.

I claim as my invention:

1. In a regulator system, the combination comprising a plurality of rolls, a motor for operating each of said rolls, each of said motors having a resistor in circuit therewith, a commutator device operated by each ot said motors, and a second commutator device associated with each motor, said commutator devices controlling a shunt circuit for said resistor, and means for varying the time intervals during which said resistor is included in said circuit to maintain a constant speed ratio between the motors.

2. ln a regulator system, the combination comprising a plurality of main rectors, a plurality of synchronous motors, a common source cl alternating current energizing said synchronous motors, a resistor in the field-magnet winding circuit of each of said main motors, means jointly controlled by the main and the synchronous motors for selectively shortcircuiting said resistors to maintain a constant speed ratio hetween the main motors, and means for simultaneously varying the speed of all main motors without varying the speed ratio between the motors.

3. in a regulator system, the combination with a plurality of main motors, synchronous motor associated with each of said main motors, and a common source or power for energizing said synchronous motors, of

for energizing said synchronous motors, a

resistor in the field-magnet winding circuit of each of said main motors, and means jointly controlled bythemain and the synchronous motors for selectively short-circuiting said resistors to maintain a constant speed ratio between said main motors.

5. In a regulator system, the combination comprising a plurality of main motors, means for adjusting the operating speed ratio of, said motors, a plurality of resistors in circuit therewith, constant-speed means associated with said main motors, and means comprising commutator devices controlled by the main motors and the constant-speed means for controlling the energization of the main motors to maintain a constantspeed ratio between them through the control of the time intervals for including said resistors in said circuits.

. 6. In a system of motor control, the comhination with an electric motor and a separate speed memher, of means responsive to speed variation between the motor to he controlled and the speed member for gradually varying the excitation of the controlled motor, said means comprising a resistor and commutators for the separate speed memher and the motor to he controlled, said commutators cocperating to intermittently short-circuit said resistor tor varying periods of time, and additional means for varying the permanent speed relationship hetween said motor and said speed memher.

2 in a system oil motor control, the comhination with an electric motor and separate speed memher, of means comprising a resistance associated therewith tor graduallyvarying tne excitation of the motor to he controlled, said means comprising conunur tators for the separate speed memherand the motor to be controlled and a resistor connected between said commutators and adapted to be'intermittently shortcircuited there hy, and additional means for varying the permanent speed relationship loetween motor and. said speed memher.

lln testimony whcrem l have hereunto subscribed my name this 3 th day of Eccenther, 1919.

WlllhLlAl-d lit; l /IENZlES

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